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To be honest...the stock barrel is decent enough for most ranges. I'd err on the side of a 6.04/6.03 vs. a 6.01.
Aside from junk that will come in via the mag an AEG is pretty much a closed-dry system. Crap can come into a GBBR via the mag too...but also the feed lips are pretty hard/sharp and can nick BBs, open bolts are...open to whatever, and the temperature changes from the gas can cause condensation on the inner barrel.
In a clean shoot-in-your-basement type setup there's probably no issue...but in field games where you're mucking about and it always seems to rain too tight of a bore will just increase the risk of jams.
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